CN113416426B - Preparation method of SBS (styrene butadiene styrene) composite modified asphalt - Google Patents
Preparation method of SBS (styrene butadiene styrene) composite modified asphalt Download PDFInfo
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- CN113416426B CN113416426B CN202110746284.9A CN202110746284A CN113416426B CN 113416426 B CN113416426 B CN 113416426B CN 202110746284 A CN202110746284 A CN 202110746284A CN 113416426 B CN113416426 B CN 113416426B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention discloses a preparation method of SBS composite modified asphalt, which comprises the following steps: SBS modified asphalt waste treatment: the SBS modified asphalt waste is crushed and screened at low temperature to prepare a base material; and stirring the base stock, the SBS modifier and the semi-oxidized asphalt firstly, and then shearing to prepare the SBS composite modified asphalt. The preparation method of the SBS composite modified asphalt has the advantages of simple production process and excellent performance, meets the technical requirements of SBS modified asphalt (I-B) in JTG F40-2004 technical Specification for road asphalt pavement construction, and can be widely applied to mixing of common asphalt and processing of modified asphalt; the SBS composite modified asphalt waste is fully utilized, so that resource waste is reduced, and the asphalt preparation cost is reduced; and the application range of the semi-oxidized asphalt is widened.
Description
Technical Field
The invention relates to the technical field of asphalt modification, in particular to a preparation method of SBS (styrene butadiene styrene) composite modified asphalt.
Background
The asphalt pavement is subjected to the natural factors of heat, moisture, ultraviolet rays and oxygen and the action of vehicle load in the long-term use process, the asphalt mixture can generate a plurality of complex physical and chemical changes, and the rheological property of the asphalt is fundamentally changed in a macroscopic view, so that the pavement is cracked and damaged, and the durability of the pavement is seriously influenced. The specific index detection shows that the viscosity is increased, the penetration index is decreased, the softening point index is improved, the ductility index is greatly reduced, and the adverse effects on the low-temperature performance and the fatigue resistance are caused。
SBS is block copolymer prepared with styrene and butadiene as monomer and through anionic polymerization and added as modifier into building Zhejiang blue and road Zhejiang blue, and has excellent weather resistance and load resistance. The SBS modified asphalt does not soften at high temperature and become brittle at low temperature, can effectively prevent temperature reduction to enable the temperature shrinkage stress generated by a pavement structure, and has an obvious effect of reducing the low-temperature cracking of the pavement. LiX, Stastna and the like research that a three-dimensional network structure is formed between hard-segment polystyrene in SBS modified asphalt mechanism SBS, the tail ends of polystyrene are connected to serve as a 'skeleton structure' to enhance the stiffness of asphalt and play a role in determining the high-temperature performance of the asphalt, and a polybutadiene soft-segment connector connected in the middle of the 'skeleton structure' enables the asphalt to show the characteristic of high elasticity; when the SBS modified asphalt is transformed from low temperature to high temperature, the asphalt is gradually changed from viscoelasticity to Newtonian fluid.
The aging of the SBS modified asphalt consists of the aging of a matrix asphalt phase and the aging failure of an SBS modifier, and the deterioration of the modifier and the matrix asphalt phase not only causes the instability of a solution system of the matrix asphalt but also causes the instability of the modifier and the matrix asphalt solution system, thereby showing the weakening of the modification effect and the deterioration of the asphalt performance on the macroscopic performance.
In order to recycle aged SBS modified asphalt, many scientists research, Chen Huaxin and other researches discover that the addition of the newly prepared SBS modified asphalt for regeneration can effectively reduce the aggregation degree of carbonyl groups in the aged SBS modified asphalt, improve the content of aliphatic hydrocarbon, reduce the viscosity and the softening point of the aged asphalt, improve the penetration degree, and increase the amount of SBS modifier in the aged SBS modified asphalt. Researches such as seasons and the like show that the low-temperature ductility of the aged SBS modified asphalt can be remarkably improved while other properties of the aged SBS modified asphalt are improved by adding the regenerant and the SBS modifier or the TPS modifier for regeneration. On the basis, the application researches the action research of the semi-oxidized asphalt, the SBS modifier and the aged SBS modified asphalt so as to expand the utilization range of the aged SBS modified asphalt.
Disclosure of Invention
Therefore, the invention aims to provide a preparation method of SBS composite modified asphalt, which makes full use of SBS composite modified asphalt waste, reduces resource waste and lowers asphalt preparation cost; and the application range of the semi-oxidized asphalt is widened.
The technical scheme of the invention is realized as follows:
a preparation method of SBS composite modified asphalt comprises the following steps:
(1) SBS modified asphalt waste treatment: the SBS modified asphalt waste is crushed and screened at low temperature to prepare a base material, wherein the low temperature is between-15 ℃ and-4 ℃; as the brittle point of the SBS modified asphalt waste is lower, the SBS modified asphalt waste is best crushed at the temperature of-15 ℃ to-4 ℃ under the balance of energy consumption cost and crushing granularity.
(2) And stirring the base stock, the SBS modifier and the semi-oxidized asphalt firstly, and then shearing to prepare the SBS composite modified asphalt.
The further technical scheme is that the screening is to screen the particle size of the SBS modified asphalt waste material after low-temperature crushing, and the particle size of the prepared base material is less than or equal to 5 cm.
The further technical scheme is that the semi-oxidized asphalt is obtained by distilling petroleum at the temperature of 350-.
Still further technical proposal is that the stirring speed of the continuous oxygen blowing and stirring is 100-200 r/min.
The further technical scheme is that the stirring speed is 50-100 r/min during stirring and shearing, and the stirring time is 20-30 min; the shearing rate is 1000-3000 r/min, and the shearing time is 10-20 min.
The further technical scheme is that the components of the SBS modifier comprise SBS, montmorillonite and EVA resin.
The SBS modifier comprises, by weight, 20-50 parts of SBS, 10-30 parts of montmorillonite and 20-30 parts of EVA resin.
The further technical scheme is that the base stock, the SBS modifier and the semi-oxidized asphalt are prepared from the following components in parts by weight: 30-50 parts of base stock, 10-20 parts of SBS modifier and 50-70 parts of semi-oxidized asphalt.
Compared with the prior art, the invention has the beneficial effects that:
(1) the preparation method of the SBS composite modified asphalt fully utilizes SBS composite modified asphalt waste, reduces resource waste and reduces asphalt preparation cost.
(2) The semi-oxidized asphalt is light oxidized asphalt, the resin content in the components is relatively more, the asphaltene is relatively less, the semi-oxidized asphalt is mixed with the processed SBS composite modified asphalt waste material, the adhesiveness of the new and old asphalt components is improved, and the semi-oxidized asphalt and the SBS modifier are added simultaneously, so that the penetration degree of the SBS composite modified asphalt can be obviously improved, namely the high-temperature performance of the SBS composite modified asphalt is improved.
(3) The EVA resin is added into the asphalt, so that the ductility (plasticity) of the modified asphalt can be improved, and the high-temperature stability, low-temperature flexibility and elasticity of the modified asphalt are further ensured.
(4) The SBS modifier is added into the asphalt, so that the softening point of the SBS composite modified asphalt can be obviously reduced, the softening point is kept between 56.5 and 59.4, and the high-temperature stability and the low-temperature crack resistance of the SBS composite modified asphalt are ensured.
(5) The preparation method of the SBS composite modified asphalt provided by the invention is simple in production process and excellent in performance, meets the technical requirements of SBS modified asphalt (I-B) in JTG F40-2004 technical Specification for road asphalt pavement construction, and can be widely applied to mixing of common asphalt and processing of modified asphalt. In addition, the preparation method of the SBS composite modified asphalt widens the application range of the semi-oxidized asphalt.
Detailed Description
For clear and complete description of the technical solutions in the present invention, it is obvious that the inventor combines the embodiments to describe, but the following embodiments describe only some embodiments of the present invention, not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
A preparation method of SBS composite modified asphalt comprises the following steps:
(1) SBS modified asphalt waste treatment: crushing SBS modified asphalt waste at-15 deg.c and screening to obtain base material with grain size less than or equal to 5 cm;
(2) and stirring the base stock, the SBS modifier and the semi-oxidized asphalt firstly, and then shearing to prepare the SBS composite modified asphalt.
The semi-oxidized asphalt is residual oil obtained by distilling petroleum at the temperature of 350 ℃ under normal pressure, oxygen is continuously blown into the residual oil at the temperature of 230 ℃ and the residual oil is stirred for 3 hours, and then the temperature is reduced to 60 ℃ to obtain the semi-oxidized asphalt. The stirring rate of the continuous oxygen blowing and stirring was 100 r/min.
Stirring at a speed of 50r/min for 30min during stirring and shearing; the shear rate is 1000r/min, and the shear time is 20 min.
The SBS modifier comprises 20 parts of SBS, 10 parts of montmorillonite and 20 parts of EVA resin in parts by weight. The base material, the SBS modifier and the semi-oxidized asphalt are prepared from the following components in parts by weight: 30 parts of base stock, 10 parts of SBS modifier and 50 parts of semi-oxidized asphalt.
Example 2
A preparation method of SBS composite modified asphalt comprises the following steps:
(1) SBS modified asphalt waste treatment: crushing SBS modified asphalt waste at-4 deg.c and sieving to obtain base material with grain size less than or equal to 5 cm;
(2) and stirring the base stock, the SBS modifier and the semi-oxidized asphalt firstly, and then shearing to prepare the SBS composite modified asphalt.
The semi-oxidized asphalt is residual oil obtained by distilling petroleum at the temperature of 500 ℃ under normal pressure, oxygen is continuously blown into the residual oil at the temperature of 250 ℃ and the residual oil is stirred for 6 hours, and then the temperature is reduced to 70 ℃ to obtain the semi-oxidized asphalt. The stirring rate of the continuous oxygen blowing and stirring was 200 r/min.
The stirring speed is 100r/min during stirring and shearing, and the stirring time is 20 min; the shear rate is 3000r/min, and the shear time is 10 min.
The SBS modifier comprises, by weight, SBS50 parts, montmorillonite 30 parts and EVA resin 30 parts. The base material, the SBS modifier and the semi-oxidized asphalt are prepared from the following components in parts by weight: 50 parts of base stock, 20 parts of SBS modifier and 70 parts of semi-oxidized asphalt.
Example 3
A preparation method of SBS composite modified asphalt comprises the following steps:
(1) SBS modified asphalt waste treatment: crushing SBS modified asphalt waste at-10 deg.c and sieving to obtain base material with grain size less than or equal to 5 cm;
(2) and stirring the base stock, the SBS modifier and the semi-oxidized asphalt firstly, and then shearing to prepare the SBS composite modified asphalt.
The semi-oxidized asphalt is residual oil obtained by distilling petroleum at the temperature of 400 ℃ under normal pressure, oxygen is continuously blown into the residual oil at the temperature of 240 ℃ and the residual oil is stirred for 5 hours, and then the temperature is reduced to 65 ℃ to obtain the semi-oxidized asphalt. The stirring rate of the continuous oxygen blowing and stirring was 150 r/min.
The stirring speed is 100r/min during stirring and shearing, and the stirring time is 30 min; the shear rate is 2000r/min, and the shear time is 15 min.
The SBS modifier comprises 30 parts of SBS, 20 parts of montmorillonite and 25 parts of EVA resin in parts by weight. The base material, the SBS modifier and the semi-oxidized asphalt are prepared from the following components in parts by weight: 40 parts of base stock, 15 parts of SBS modifier and 60 parts of semi-oxidized asphalt.
Comparative example 1
The comparative example was conducted in the same manner as example 1 except that no semioxidized pitch was added as compared with example 1.
Comparative example 2
Compared with the example 1, no montmorillonite is added, and the rest is the same as the example 1.
Comparative example 3
The procedure of example 1 was repeated except that no EVA resin was added as compared with example 1.
Comparative example 4
Compared with the example 1, the modifier (the weight ratio of the components of the SBS modifier is SBS20 parts, montmorillonite 10 parts and EVA resin 20 parts) is not added, and the rest is the same as the example 1.
Performance test
In table 1: the detection of softening point, ductility, penetration and segregation difference refers to the standard JTG F40-2004 technical Specification for construction of road asphalt pavement.
TABLE 1
As can be seen from examples 1-3 and comparative examples 1-4, the penetration degree of the SBS composite modified asphalt is between 85.9 and 88.2, which is higher than that of the SBS modified asphalt waste and the comparative examples; the penetration degree of the comparative examples 1 to 4 is higher than that of SBS modified asphalt waste, so that the penetration degree of the materials is respectively improved by adding the semi-oxidized asphalt and the SBS modifier; as can be seen from examples 1-3 and comparative examples 1 and 4, the penetration of the modified asphalt with the addition of both the semi-oxidized asphalt and the SBS modifier is significantly higher than that of the modified asphalt with the addition of either the semi-oxidized asphalt or the SBS modifier alone.
As can be seen from examples 1-3 and comparative examples 1-4, the ductility of the SBS composite modified asphalt is 42.6-46.1, which is higher than that of the SBS modified asphalt waste and the comparative examples; as can be seen from the comparative example 3, the ductility of the SBS composite modified asphalt is very low without the EVA resin and is only higher than that of the SBS modified asphalt waste, so that the ductility of the SBS composite modified asphalt can be obviously improved by the EVA resin, namely, the plasticity of the SBS composite modified asphalt is improved. From the ductility of the comparative examples 1-2, it can be seen that the ductility (plasticity) of the SBS modified asphalt is not greatly affected by the semi-oxidized asphalt and the montmorillonite.
As can be seen from examples 1-3 and comparative examples 1-4, the softening point of the SBS composite modified asphalt is between 56.5 and 59.4, which is lower than that of the SBS modified asphalt waste and the comparative examples; as can be seen from comparative examples 1-4, the semi-oxidized asphalt, the montmorillonite and the EVA resin have little influence on the softening point of the SBS composite modified asphalt, and the SBS obviously reduces the softening point of the SBS composite modified asphalt.
As can be seen from examples 1-3 and comparative examples 1-4, the segregation difference of the SBS composite modified asphalt is less than 2.5, wherein the segregation difference of the half-oxidized asphalt and the EVA resin on the SBS composite modified asphalt has little influence, and the montmorillonite and the SBS remarkably reduce the segregation difference of the SBS composite modified asphalt.
According to the table 1, the technical indexes of the SBS composite modified asphalt are as follows: the 25 ℃ penetration is 85.9-88.2dmm, the 5 ℃ ductility is more than 40cm, the softening point is more than 50 ℃, and the segregation difference is less than 2.5 ℃, therefore, the SBS modified asphalt has simple production process and excellent performance, reaches the technical requirements of SBS modified asphalt (I-B) in JTG F40-2004 technical Specification for road asphalt pavement construction, and can be widely applied to common asphalt mixing and modified asphalt processing.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A preparation method of SBS modified asphalt is characterized in that: the method comprises the following steps:
(1) SBS modified asphalt waste treatment: the SBS modified asphalt waste is crushed and screened at the temperature of-15 to-4 ℃ to prepare a base material;
(2) stirring the base stock, the SBS modifier and the semi-oxidized asphalt firstly and then shearing to prepare the SBS composite modified asphalt, wherein the base stock, the SBS modifier and the semi-oxidized asphalt are prepared by the following weight ratio: 30-50 parts of base stock, 10-20 parts of SBS modifier and 50-70 parts of semi-oxidized asphalt, wherein the SBS modifier comprises, by weight, 20-50 parts of SBS, 10-30 parts of montmorillonite and 20-30 parts of EVA resin.
2. The method for preparing SBS composite modified asphalt according to claim 1, wherein the method comprises the following steps: the screening is to screen the particle size of the SBS modified asphalt waste material after low-temperature crushing, and the particle size of the prepared base material is less than or equal to 5 cm.
3. The method for preparing SBS composite modified asphalt according to claim 1, wherein the method comprises the following steps: the semi-oxidized asphalt is residual oil obtained by distilling petroleum at the temperature of 350-500 ℃, oxygen is continuously blown into the residual oil at the temperature of 230-250 ℃ and the residual oil is stirred for 3-6h, and then the temperature is reduced to 60-70 ℃ to obtain the semi-oxidized asphalt.
4. The method for preparing SBS composite modified asphalt according to claim 3, wherein: the stirring speed of the continuous oxygen blowing and stirring is 100-200 r/min.
5. The method for preparing SBS composite modified asphalt according to claim 1, wherein the method comprises the following steps: stirring is carried out firstly, then, shearing is carried out, the stirring speed is 50-100 r/min, and the stirring time is 20-30 min; the shearing rate is 1000-3000 r/min, and the shearing time is 10-20 min.
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